Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a9128d8d9b4628…

MALICIOUS

PDF

85.0 KB Created: 2021-09-08 03:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 32d21f58678942b4cf86572655e7e07c SHA-1: 9a7f5658eed6c24ea1e34da659b533d0a08d6aae SHA-256: c8a9128d8d9b4628eba6ad4a4b323159869dcb195afef3bbf141cad955e30f1b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is likely responsible for initiating these redirects or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://toananhmedical.com/uploads/files/nifugitubo.pdf In PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/557678dcfd77d0c3b50bbe9c0a21e7ba/20482256089.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/gekuga.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610012789b748---xekevepegelefokebedamiz.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/ropenoxexuxivupezipug.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/ebe57ecace889175d06a187e33d0fed3/70905942580.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/6829714472.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/93b60e981855fbaeb64c3a36d0aa59d4/vujaladuzuleguxaraw.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabc45c39b9---vuzorelerewazadafo.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/pijiwuredato.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/8629941367c4471cda19f5575d1380a1/limoduziwesudelefonuvu.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/40310526336.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/e6a7840bf214a8a4b15873126e9f002d/zufajirefoxe.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/60388252.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/81136570744.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb30808748---49628874905.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/zomatajafun.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/dofam.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/gupuxetimefinov.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/40679766144.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef229090d6---47480899633.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/bitelinike.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071e423cfe1c---sedomusovipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=comparison+between+classical+and+operant+conditioning+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEB 11220 bytes
SHA-256: dca9b016bc204c47e57cdc462d3891eac663fb7773ba73ecf8ff50205eaeee85
font_02_sfnt_off000115d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D3 18464 bytes
SHA-256: b94300138183b389dbae0034bd65a4bf06601aeb14d3536173e20c397a71f6b3

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